What we know of Codename D is that it involves an "evil amusement park" filled with creatures, and it carries a baseball theme thanks to a TGS debut trailer.
"You must fight for your life to survive an evil amusement park filled with twisted and eerie creatures. With codename D for Kinect for Xbox 360, you are the controller as you unleash devastating effects to destroy enemies and objects," announced Microsoft at last year's Tokyo Game Show. No further details got spilled.
The name Diabolical Pitch certainly fits with the game's description and look from the trailer, which you can see below. Our arms are likely to get tired for sure.